nanog mailing list archives

Re: F-ckin Leap Seconds, how do they work?


From: Owen DeLong <owen () delong com>
Date: Tue, 3 Jul 2012 02:03:10 -0700

DST is a time-zone specific phenomenon.

Leap seconds are changes to the actual core time. UTC moves with leap seconds.

It doesn't move with DST or other timezone weirdnesses.

The system clock needs to be UTC, not UTC ± some offset stuck somewhere that keeps some form of running tally of the 
current leap second offset since the epoch.

Owen

On Jul 3, 2012, at 1:54 AM, Wolfgang S. Rupprecht wrote:


Steven Bellovin <smb () cs columbia edu> writes:
See
http://landslidecoding.blogspot.com/2012/07/linuxs-leap-second-deadlocks.html

Maybe we should stop wrenching the poor system time back and forth.  We
no longer add or subtract daylight savings time (or timezones) to the
kernel time, why do we do it with leapseconds?  We should really move
the leapseconds correction into the display routines like DST and
timezones already are.  I believe the Olson time code already has ifdefs
for doing this.  I wonder why the system's internal time isn't run that
way.

-wolfgang
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